Following Carly Simon Duet, Taylor Swift Knows Who ‘You’re So Vain’ Is About’

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This past weekend in Foxboro, Mass., Taylor Swift joined a very exclusive club.

It’s the small club of people who (allegedly) know whom Carly Simon’s song “You’re So Vain” is actually, truly about. And no, she’s not telling.

The occasion came about when Swift invited Simon to sing her iconic 1972 hit song on stage with her during the Red Tour’s stop in at Gillette Stadium on Saturday (July 27). It was an experience Swift called “unreal.”

Swift was thrilled to get a chance to perform classic song alongside its creator. “I think tonight is one of the most special nights on the tour,” she said in a video interview (above) shot backstage at the July 27th show.

Got to sing 'You're So Vain' with Carly Simon at Gillette Stadium tonight!!!!! Unreal. I could not possibly look up to her more.